Machine for cutting key-bits.



B. KOTKOVSKY. MACHINE FOR CUTTING KEY BITS. APPLICATION FILED AUG. 1, 1910.

1,025,917. v PatentedMdy'Y, 1912.

IBENJAMEN KorKovsKfz, or PARIS, FRANCE.

MACHINE FOR CUTTING KEY-BITS.

To all whom, z't may concern:

Be it known that I, BENJAMEN Korkov- SKY, a subject of the Emperor ofRussia, and resident of Paris, France, have invented cer- 5 tain new anduseful Improvements in Ma- Cit chines for Cutting Key-Bits, of which thefollowing is a specification.

This invention relates to a machine for cutting key bits and moreparticularly those of keys for safety looks.

The machine is constructed so that any number of keys can be cutsimultaneously after the same pattern.

In the accompanying drawings the improved machine is shown by way ofexample.

Figure l is a plan view of the machine. Fig. 2 is a vertical. sectiontaken partly through the axis of the machine. Fig. 3 is a side view ofthe cutters in the radial positions shown in plan in Fig. 1. Fig. 4;shows a key bit corresponding to the cutters (Fig. 3). Fig. 5 is a planview of the toothed disk. Fig. 6.,shows in side elevation and in planview the nut for holding the lower ends of the uncut keys. Fig. 7 showsin plan view and in side elevation the sleeve with hooks for grippingthe bows of the keys.

The machine comprises the cylindrical frame a with the horizontal tableI) and a horizontal flange 0 which serves for fixing the cylindricalframe upon a convenient support by means of screws, rivets, or the like.In the center of the cylindrical frame a the vertical shaft (Z ismounted which carries at its lower end the driving pulley e. The upperpart of said vertical shaft CZ which proj sets from the table 5 has twothreaded parts f and g of different diameter. Upon the part f a nut 7bis screwed (Fig. 6) which has notches 2' designed to receive the lowerend of the uncut key. These notches can either be circular as i or withparallel sides as a, Fig. 6, according to the shape of the key to beout. There are as many notches as keys are to be cut simultaneously; inthe example shown four notches are provided. The keys to be cut aremounted in. said notches of the nut 72. so that they stand parallel withthe central shaft (Z and they are maintained in their position by meansof a sleeve 70 (Fig. 7) which is mounted upon the upper end of thecentral shaft cl so that it can be adjusted in vertical directionaccording to the height of the keys and that it is further free to beturned on said shaft. This sleeve 70 has as Specification of LettersPatent.

Application filed August 1, 1910.

Patented May 7, 1912.

Serial No. 575,020.

many hooks m projecting from its periphery as there are notches in thenut 71.. Said hooks m are made to grip the bows of the keys by slightlyturning the sleeve 72 on the shaft d. The sleeve is secured in itsposition by means of a locking nut n screwed upon the upper threadedpart 9 of the shaft. The four keys are thus securely fixed to thecentral shaft (Z so that they turn with the same if said shaft is madeto revolve.

The table I) has a certain number of radial slots 0 (eight in theexample shown) which serve for guiding the slides p. The slides 22 formracks on their lower surfaces and mesh with the upper toothed surface ofa disk (1 (Fig. 5). This disk 9 can revolve around the central shaft (Zand it is driven by a bevel wheel 1" keyed upon a horizontal shaft 8.This horizontal shaft receives its motion from a crank handle not shownin the drawing. By turning said handle in a certain direction the disk 9is made to revolve in the same direction and causes by means of itsspiral-shaped toothed crown the slides 79 to move simultaneously towardor away from the central shaft d. In the slides 79 the tool supports tare mounted so that they can be adjusted in said slides. With thisobject in view a screw-spindle a having a hand wheel 2; at its outerend, is located in the slide 10 so that it can freely turn in itsbearings. The tool support t is screwed upon the front end of said screwspindle so that it goes forward or backward according to the directionin which said screw spindle is being turned. Each tool support t carriesa vertical screw bolt w, parallel with the central shaft d upon whichthe circular saw as or any other cutting tool is mounted. The distancebetween the cutting tool m and the table 6 is regulated by means of thewasher y. The cutting tool an is secured in its position by means of anut a screwed upon the upper end of the screw bolt w.

It is easy to understand that the position of the cutting tools a: abovethe table Z) can be regulated according to the height at which theincision in the key bit has to be made and that their position withregard to the central shaft 6, can be regulated accord ing to the depthof the incision to be made. After the position of all the cutting toolshas been regulated by the adjustment of the various cutters to thepattern key held in the workholder the slides 22 are withdrawn from thecentral shaft and moved back.

After the keys to be out have been mounted in the machine in the mannerhereinbefore described, the driving pulley e is put in gear so that allthe keys turn around with the central shaft. The horizontal shaft 8 ishereupon turned by hand so that all the cutting tools a" move toward thecentral 7 shaft. Each of the cutting tools will thus make an incision inthe bits of all the keys and exactly at the same place and of exactlythe same depth.

Fig. 3 shows by way of example the different positions of the circularsaws a: for cutting the key bit in the manner shown in Fig. 4:. It isobvious that if only one of the Washers is replaced by a washer ofdifferent height or if only one of the hand wheels is slightly turnedthe key bit is completely modified so that by means of this improvedmachine an almost unlimited number of key patterns can be easilyobtained.

The hand wheels 0 are preferably graduated in order to facilitate theadjustment of the tool supports.

The use of circular saws as cutting tools is very practical as thesesaws out only with one tooth so that if this tooth is worn off it can bequickly and easily replaced by another tooth of the circular saw.

I claim An improved machine for cutting key bits comprising incombination a cylindrical frame having a certain number of radial slotsin the top plate, a vertical shaft revolubly mounted in the center ofsaid cylin drical frame, means for revolving said shaft, a threaded partof said shaft projecting from said frame, a nut screwed upon saidthreaded part and having radial notches in its periphery designed toreceive the lower ends of the keys, a sleeve adjustablymounted upon theupper end of said central shaft, radial hookshaped arms of said sleevedesigned to grip the bows of the keys, a threaded part at the upper endof said central shaft and a locking nut screwed upon said threaded partand locking the sleeve in its position, slides movably mounted in saidradial slots of the frame, means for simultaneously adjusting by handall the slides in their guide slots, the tool supports adjustablymounted in said slides, means for regulating the radial distance of thetool supports from said central shaft and a circular saw on each of saidsupports, substantially as described and for the purposcf'l set forth.

In witness whereof I have hereunto setmy hand in the presence of twowitnesses. BENJAMEN KOTKOVSKY.

Vitnesses DEAN B. MAsoN, ALBERT DE CARSALADO.

Washington, D. C.

by addressing the Commissioner of Patents, Ii

